diff --git a/src/json.hpp b/src/json.hpp
index 0594b38d..8fb400c7 100644
--- a/src/json.hpp
+++ b/src/json.hpp
@@ -2148,6 +2148,7 @@ class basic_json
     string_t dump(const int indent = -1) const
     {
         std::stringstream ss;
+        ss.imbue(std::locale("C"));
 
         if (indent >= 0)
         {
@@ -5653,11 +5654,20 @@ class basic_json
         const bool pretty_print = (o.width() > 0);
         const auto indentation = (pretty_print ? o.width() : 0);
 
+        // save locale of o
+        auto old_locale = o.getloc();
+        // set locale of o to "C"
+        o.imbue(std::locale("C"));
+
         // reset width to 0 for subsequent calls to this stream
         o.width(0);
 
         // do the actual serialization
         j.dump(o, pretty_print, static_cast<unsigned int>(indentation));
+
+        // reset locale
+        o.imbue(old_locale);
+
         return o;
     }
 
diff --git a/src/json.hpp.re2c b/src/json.hpp.re2c
index f4ddacf7..2422ef8b 100644
--- a/src/json.hpp.re2c
+++ b/src/json.hpp.re2c
@@ -2148,6 +2148,7 @@ class basic_json
     string_t dump(const int indent = -1) const
     {
         std::stringstream ss;
+        ss.imbue(std::locale("C"));
 
         if (indent >= 0)
         {
@@ -5653,11 +5654,20 @@ class basic_json
         const bool pretty_print = (o.width() > 0);
         const auto indentation = (pretty_print ? o.width() : 0);
 
+        // save locale of o
+        auto old_locale = o.getloc();
+        // set locale of o to "C"
+        o.imbue(std::locale("C"));
+
         // reset width to 0 for subsequent calls to this stream
         o.width(0);
 
         // do the actual serialization
         j.dump(o, pretty_print, static_cast<unsigned int>(indentation));
+
+        // reset locale
+        o.imbue(old_locale);
+
         return o;
     }